Two entries with the name Glas.

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Glas

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The sword wielded by Arthur’s warrior Bwlch in Culhwch and Olwen.

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Source
Culhwch and Olwen | Late 11th century

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Glas

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The name of a hound in Culhwch and Olwen.

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Source
Culhwch and Olwen | Late 11th century

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See also
Gleisyad | The Legend of King Arthur
Glessig | The Legend of King Arthur

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